1. Department of Hepatobiliary Surgery and Visceral Transplantation, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.
2. Department of Biologic and Materials Sciences, University of Michigan, Ann Arbor, Michigan.
3. Department of Internal Medicine I, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.
4. Institute for Neuroanatomy, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.